I am changing the stitch for a swing jacket - from stockinette to seed stitch.

I have run into a problem when trying to decrease across the row - I need to eliminate 4 sts (seed 10 then dec, 2x, knit across to 24 st remaining dec, seed 10, dec, seed to end. This is done every 13th row 4x which would give me flair across the back.

When I follow the instructions here I end up with 2 of the same sts side by side k,p,p,k or p,k,k,p instead of k,p,k,p. then when I seed the next rows I am confused with the side by side sts when I get to the marker for the dec st.